/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassProcessingTypes.h
Creates an instance of ProcessorClass and adds it to Processors without any additional checks
void AppendProcessor ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UMassProcessor](API\Plugins\MassEntity\UMassProcessor) > ProcessorClass, [UObject](API\Runtime\CoreUObject\UObject\UObject) & InOwner )